ATS128 datasheet(15/25 Pages) ALLEGRO

15 / 25 page

Highly Programmable, Back-Biased,

Hall-Effect Switch with TPOS Functionality

ATS128LSE

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Table 3. Programming Logic Table

[Selection Key]

Bit Field Address (Code)

Notes

Binary

(MSB

→LSB)

Decimal

Equivalent

Try Mode Register Selections1

BOP Positive, Trim Up-Counting

[ 2 × VPH ]

00000000

Increase BOP (South field), wraps back to code 0.

11111111

255

BOP selection is at maximum value.

BOP Negative, Trim Up-Counting

[ VPH → VPM → 2×VPH ]

00000000

Increase BOP (North field), wraps back to code 0.

11111111

255

BOP selection is at maximum value.

BOP Positive, Trim Down-Counting

[ 2 × VPH → 4×VPM → VPH ]

11111111

Decrease BOP (South field), wraps back to code 0. Code is automatically

inverted (code 1 selects BOP selection maximum value minus 1.)

00000000

255

BOP selection is at minimum value.

BOP Negative, Trim Down-Counting

[VPH → VPM → 2×VPH

→ 4 × VPM → VPH ]

11111111

Decrease BOP (North field), wraps back to code 0. Code is automatically

inverted (code 1 selects BOP selection maximum value minus 1.)

00000000

255

BOP selection is at minimum value.

Output / Fuse Checking

[ VPH → 3×VPM → VPH ]

x01

Output Fall Time (FALL). Least significant bit.

x11

Output Fall Time (FALL). Most significant bit.

0xx

Output Polarity Bit (POL). Default, no fuse blowing required.

POL = 0, VOUT = Low opposite target tooth.

1xx

Output Polarity Bit (POL).

POL = 1, VOUT = High opposite target tooth. Code references a single bit only.

1000

Fuse Threshold Low Register. Checks un-blown fuses. Code references a

single bit only.

1001

Fuse Threshold High Register. Checks blown fuses.

Blow or Read Mode Register Selections2

BOP Selection

(BOPSEL)

[ 2 × VPH

→ 11 × VPM → VPH ]

00000000

BOP magnitude selection. Default, no fuse blowing required.

Minimum value, corresponding to AGRange(max).

11111111

255

BOP magnitude selection. Maximum value, corresponding to AGRange(min).

BOP Polarity

(BOPPOL)

[ VPH → VPM → VPH

→ 11 × VPM → VPH ]

South field polarity. Default, no fuse blowing required.

North field polarity.

Output / Lock Bit

[ VPH → 3×VPM → VPH

→ 11 × VPM → VPH ]

Output Fall Time (FALL). Default, no fuse blowing required.

Output Fall Time (FALL) selection is at maximum value.

000

Output Polarity Bit (POL). Default, no fuse blowing required.

POL = 0, VOUT = Low opposite target tooth.

100

Output Polarity Bit (POL). Code refers to bit 2 only. POL = 1, VOUT = High

opposite target tooth.

10000

Lock bit (LOCK). Locks access to all registers with exception of Fuse

Threshold registers. Code refers to bit 5 only.

0 to 1111111

–

Read mode bit values. Sequentially selects each bit in selected Blow mode register

for reading bit status as blown or not blown. Monitor VOUT after each pulse.

1Code 1 is automatically selected after the falling edge of the final VPH in the register key. Each subsequent VPM in the bit field addresses the next

decimal code.

2Bit 0, or code 1, is automatically selected after the falling edge of the final VPH in the register key. Each subsequent VPM in the bit field addresses the

next bit.

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